def add(a,b):
    print(f"ADDING {a} + {b}")
    return a + b
def substract(a,b):
    print(f"SUBSTRACTING {a} - {b}")
    return a - b
def multiply(a,b):
    print(f"MULTIPLYING {a} * {b}")
    return a * b
def divide(a,b):
    print(f"DIVIDING {a} / {b}")
    return a / b

print("Let's do some math with just function!")

age = add(30 , 5)
height = substract(78,4)
weight = multiply(90,2)
iq = divide(100,2)

print(f"Age: {age}, Height: {height}, Weight: {weight}, IQ: {iq}")

#A puzzle for the extra credit, type it in anyway.
print("Here is a puzzle.")

what = add(age, substract(height, multiply(weight, divide(iq,2))))

print("That becomes:",what,"\n""Can you do it by hand?")
